Peanut hay is a solid feed option for cows, particularly beef cattle, and when properly harvested it’s comparable to good-quality grass hay in nutrient content. It typically contains around 11% crude protein and 55% total digestible nutrients (TDN), which places it in a useful middle range for maintaining adult cattle. That said, the type of peanut hay matters enormously. There are two very different products that go by this name, and the quality gap between them is significant.
Two Types of Peanut Hay
The term “peanut hay” can refer to either residual peanut vine hay (the leftover tops after peanuts are harvested from a grain crop) or perennial peanut hay, which is a dedicated forage crop. These are not interchangeable, and confusing them leads to feeding mistakes.
Residual peanut vine hay is a byproduct. After peanuts are dug and the nuts removed, the remaining vines, stems, and leaves are baled. This is by far the most widely used peanut byproduct fed to beef cattle. Its quality depends heavily on how much leaf material survives the harvest. If baled with minimal leaf shatter, it performs well. If the leaves have mostly fallen off, you’re left with fibrous stems that won’t do much for a cow nutritionally.
Perennial peanut hay, on the other hand, is a legume forage grown specifically for livestock feed. It’s often called the “alfalfa of the South” because it thrives in warm southeastern climates where alfalfa struggles. Perennial peanut is a true legume, and legume hays generally run 16 to 22% crude protein, substantially higher than residual vine hay. Varieties like Florigraze and Arbrook, released in the 1980s, dramatically increased forage production and helped make perennial peanut a staple hay crop in Florida and the Gulf states.
Nutritional Value for Beef and Dairy Cattle
At 11% crude protein and 55% TDN, residual peanut vine hay meets the maintenance requirements for most dry, nonlactating beef cows. It won’t carry a cow through peak lactation on its own, but it works well as a base forage when supplemented appropriately. For context, a mature beef cow in early lactation needs roughly 10 to 11% crude protein and around 55 to 60% TDN, so peanut vine hay lands right at the lower edge of what’s needed during that stage.
Perennial peanut hay is a different story. With protein levels closer to those of alfalfa, it can support lactating cows and growing calves with less supplementation. It also provides more calcium and energy per pound than grass hays, making it a premium forage where available.
Dairy cattle have higher protein demands, often requiring total diets above 16% crude protein. Residual peanut vine hay alone won’t meet those needs, but it can still serve as a roughage component in a mixed ration. Some peanut byproducts, like peanut skins, can actually boost milk production when included at moderate levels in dairy diets that already meet protein requirements.
Quality Problems to Watch For
Peanut hay has a few quirks that other hays don’t, and ignoring them can cause real problems.
Soil Contamination
Because peanuts grow underground, the vines pick up soil during harvest. This dirt sticks to stems and leaves and shows up as unusually high ash content in forage tests. Residual peanut vine hay typically runs 8 to 16% ash, which is well above what you’d see in most grass or legume hays. High ash means less actual digestible feed per pound. If you’re buying peanut hay, a forage test is worth the cost, because ash content alone can tell you a lot about how clean the harvest was.
Leaf Shatter
The leaves are where most of the protein and energy live. Rough handling, over-drying, or poor baling practices cause leaves to break off and fall to the ground. A bale of peanut hay with good leaf retention looks and feeds very differently from one that’s mostly stems. When evaluating bales, break one open and check how much leaf material is present.
Aflatoxin Risk
Peanut products are naturally susceptible to aflatoxin, a toxin produced by mold. The FDA sets specific limits depending on the class of cattle being fed. Finishing beef cattle can tolerate peanut products up to 300 parts per billion (ppb). Breeding beef cattle have a lower threshold of 100 ppb. For dairy cattle, immature animals, or situations where the intended use isn’t specified, the limit drops to 20 ppb. If you’re sourcing peanut hay from a region with warm, humid conditions, testing for aflatoxin before feeding is a practical safeguard, especially for dairy herds or young stock.
Fungicide Residues
This one catches people off guard. Fungicides used during commercial peanut production for the grain crop are not cleared for livestock feed use. Residual peanut vine hay from a treated crop may carry fungicide residue, which creates a regulatory gray area. If you’re buying vine hay from a peanut grower, ask what was applied during the growing season.
Baling and Storage
Peanut hay follows the same moisture rules as other hays, but its tendency to hold soil moisture makes getting it right a bit trickier. The target moisture for baling is 15 to 20%. Below 15%, you lose more leaves during baling. Above 20%, mold becomes a concern in storage, which compounds the aflatoxin risk that peanut hay already carries.
If conditions force you to bale above 20% moisture, options include applying a mold-inhibiting preservative for hay in the 20 to 30% range, or wrapping bales in plastic at 50 to 65% moisture to create silage. Stored hay should stay below 20% moisture to prevent heating and mold growth. For peanut hay specifically, proper storage matters more than it does for bermudagrass or fescue because of the aflatoxin issue.
How Peanut Hay Compares to Other Forages
Residual peanut vine hay, at 11% crude protein, sits above most mature warm-season grass hays like bermudagrass or bahiagrass, which often test in the 7 to 10% range. It’s a meaningful step up from low-quality hay, though it falls short of legume-quality forage.
Perennial peanut hay competes directly with alfalfa in protein and digestibility, but at a lower cost in the regions where it grows well. The catch is availability. Perennial peanut is adapted primarily to the lower Southeast, particularly Florida and parts of the Gulf Coast. It doesn’t establish well in wetter soils or more northern areas, so it’s not an option everywhere.
For beef cow operations in peanut-growing regions, residual vine hay is often the most economical forage available after peanut harvest. It stretches the feed budget when used as a base hay, especially for dry cows or cows in mid-gestation. Pairing it with a protein supplement or better-quality hay during lactation fills the nutritional gaps without requiring a complete diet overhaul.
Peanut Hulls and Skins Are Not Peanut Hay
Other peanut byproducts sometimes get lumped in with peanut hay, but they serve different roles. Peanut hulls are high in fiber and low in protein, making them useful as a roughage source in finishing diets at up to 20% of the ration, but they should not be a primary feedstuff. Peanut skins contain high levels of tannins, which bind to protein and reduce its availability. At levels above 10% of the diet, peanut skins can cause significant drops in performance unless the total ration already supplies at least 15% crude protein or includes added nitrogen sources like urea.